Hi Manish,
The user status allows you to manage business transactions by WBS element. To setup you have to perform at least the following activities:
1 - Create a Status Profile in SPRO
2 - Assign to the Project header data (control data)
3 - You will see the User Status, and will be able to change it clicking on ! Icon.
4 - Change anytime to the desired status. When you do this, the WBS element will be affected in the way that only the business transactions you setup for the user status will be allowed,
Regards,
Rodrigo Glauser